Reference to matrix-static

[wchresta]

With the matrix-static package (https://hackage.haskell.org/package/matrix-static), there exists a wrapper around matrix that keeps dimension information on the type level. There are multiple possible interactions between these two packages:

• References to each other for users to choose the right package for the right circumstances.
• Transferring some static information into matrix when there are clear performance improvements due to the dimension safety.

If you'd like any changes on matrix-static, please don't hesitate to open issues. This issue can be closed whenever this thread of discussion has concluded.